@AlbertoC I'm talking about the present, not the past
EDIT-Also, my brother works at Wal-mart, and I checked with him for the reasons and he said those were the main reasons

@Chrno-x read @rjejr's comment and the reason Wii U is selling worse is
1. Parents become confused with the name "Wii U"
2. Xbox 360/PS3 have been out longer
3. People don't about the Wii U
4. The Wii U has just been released/not enough meat(games) on the Wii U
5. Casual people not used to the jump in price(Xbox and PS3 are cheaper)
And have you noticed Xbox and PS3(mainly Xbox) rely on second or third parties?

@TrueWiiMaster You forgot about rayman origins as being a good game.
@Nintendoftw Check out ign for reviews.